 |
|
Exposure Level Tester
The Narda ELT-400 Exposure Level Tester is an innovative exposure level meter for measuring magnetic fields in the workplace and in public spaces. The model is designed for health and safety professionals in industry, the insurance business and the service industry. The instrument can handle practically any level measurement requested in the low and medium-frequency range, simply and precisely. It is comparable to the sound level meters that are commonly used in the assessment of noise at the workplace.
Narda ELT-400 Features:
- Direct evaluation of field exposure in comparison to major standards
- Automatic exposure evaluation for various waveforms
- Eliminates the overestimation occurring occasionally with FFT-based evaluation
- Ultra wide frequency range (1 Hz to 400 kHz)
- Wide measurement range (up to 80 mT, type-depending)
- Isotropic 100 cm2-probe (complies with standards)
- Three-axis analogue signal output
Narda ELT-400 Applications:
Production Area:The Narda ELT-400 Exposure Level Tester is useful with diverse machinery used in manufacturing. This includes induction heating, melting and hardening equipment. Also - thanks to the extremely low frequency limit and high power capability - most magnetic stirrers can be measured. Special demands often occur with machinery in production areas where non-sinusoidal signals are common, e.g. in industrial applications that use resistance welding machinery (pulse waveform, phase angle control) with traditional 50/60 Hz systems as well as in newer medium-frequency switching units.
General Environment:In public spaces, complex fields occur with several kinds of electronic article surveillance systems. Most of the electromagnetic and acustomagnetic gates are operated in the frequency range of the Narda ELT-400.
EMC Test House:Magnetic fields generated by household appliances or other electrical devices are receiving increased attention. Some new standards such as EN 50366 describe how to investigate such products. The Narda ELT-400 is the ideal measuring device when it comes to compliance with these standards. Benefits include the perfectly matched frequency range and implementation of the specified transfer function. The aim of this new generation Narda ELT-400 is to greatly simplify the assessment process. With the EXPOSURE STD (Shaped Time Domain) mode, the instrument achieves a new standard in simple but reliable measurement of magnetic fields, whether straightforward or in very complex field environments. Time-consuming and easily misinterpreted measurements with a spectrum analyzer or a scope are rendered obsolete. Detailed knowledge about the evaluation procedure or the field waveform or frequency is no longer needed. The results are reliable, and speed and ease of use are significantly improved over all traditional methods.
Narda ELT-400 Specifications:
| Magnetic (B-) Field |
| Sensor System |
Coil
(100 cm2) |
| Measurement Axis |
Tri-Axial (isotrop) |
| Exposure STD Mode |
| Frequency Range (-3dB), selectable |
1 Hz to 400 kHz, 10 Hz to 400 kHz, 30 Hz to 400 kHz |
| Exposure Evaluation |
Compared to Standard |
| MODE |
ICNIRP |
BGV B11 |
EN 50366 |
| RANGE |
LOW |
HIGH |
LOW |
HIGH |
LOW |
HIGH |
| Overload
Limit |
160% |
1.600% |
160% |
1.600% |
160% |
1.600% |
| Nominal
Range |
10% |
100% |
10% |
100% |
10% |
100% |
| Noise
Level, approximate |
1.3% |
6% |
0.4% |
6% |
0.4% |
6% |
| Damage
Level RMS (Peak) |
160 mT (226 mT) |
| Resolution
(RANGE: LOW) |
0.001 % |
| Detection,
selectable |
Automatic according to selected Standard or RMS
(averaging time 1 s) or Peak Value |
| Field Strength Mode |
| Frequency Range (-3dB), selectable |
1 Hz to 400 kHz, 10 Hz to 400 kHz, 30 Hz bis 400 kHz |
| Frequency Response |
Flat |
| MODE |
320 µT |
8 mT |
80 mT |
| RANGE |
LOW |
HIGH |
LOW |
HIGH |
LOW |
HIGH |
| Overload Limit |
32 µT |
320 µT |
800 µT |
8 mT |
8 mT |
80 mT |
| Nominal Range |
2 µT |
20 µT |
50 µT |
500 µT |
500 µT |
5 mT |
| Noise Level, approximate |
70 nT |
320 nT |
1.8 µT |
8 µT |
18 µT |
80 µT |
| Damage Level RMS (Peak) |
160 mT (226 mT) |
| Resolution (RANGE: LOW) |
1 nT |
| Overall Uncertainty |
±4 % (50 Hz to 120 kHz) |
| Detection, selectable |
RMS (averaging time 1 s) or Peak Value |
| Display Mode, selectable |
Instantaneous or Max Hold |
| Output |
| Analog Scope Output |
Three Channel (X-Y-Z) |
| Output Level |
50 mV rms at scale final value of Nominal Range (Impedance: 50 Ohm, nominal) |
| Interface (Remote Control and Readout) |
RS-232 (19200 baud, 8n1, XON/XOFF), 3-Wire, Stereo Jack 2.5 mm |
|
